Mechanochemical Doping of a Non-Metal Element into Zinc Oxide
J. Wang, J. F. Lu, Q. W. Zhang, S. Yin, T. Sato and F. Saito
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University,
Katahira 2-1-1, Aobaku, Sendai, 980-8577 (Japan)
E-mail: zhangqw@tagen.tohoku.ac.jp
Pages: 249-253
Abstract
We developed a method for narrowing the band gap in an oxide powder such as ZnO by doping other components such as S (sulphur) and N (nitrogen). The method consists of grinding a mixture of ZnO powder and non-metal element in air, followed by heating the milled sample at 400 oC. The former enables us to cause mechanochemical reaction between the components, and the latter allows us to enhance the bonding strength, as well as to remove the unreacted starting samples away from the surface of the oxide particles. The temperature has to be chosen in the heating operation so as to avoid any decomposition of the doped sample. The detailed information on doping S and N into ZnO powder, as well as its photo-catalytic reactivity, is shown in this report.
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